. ♪ chevron has been developing energy here for decades. we need to protect their environment. we have a strict quarantine system to protect the integrity of the environment. forty years on, it's still a class-a nature reserve. it's our job to look after them. ...it's my job to look after it. ♪ >>> a 360 exclusive tonight, robert menendez finally speaking out about allegations of improper travel, parties with prostitutes and his relationship with a generous donor. allegations were raised just before election day. senator menendez, new chair of senate foreign relations committee has been under growing pressure to address them. he is speaking out exclusively to our correspondent dana bash. you asked the senator some tough questions. what did he tell you? >> reporter: he admitted and apologized to making some travel and not paying that back. a lot of money on that, but he vehemently denied anything that was untoward or tawdry, particularly with prostitutes. can you explain why it took so long to pay back flights you took with your friend? >> i was in a big travel schedule in 201